"In the spot where her mother had been stood a silvery-gray wolf."
"Most of his fluffy brown chick down had fallen out by the time I met him, having been replaced by sleek, silvery-gray feathers on his back and off-white feathers on his belly—the juvenile coloration for this species."
"Though they still had bits of brown fluff here and there, they now sported the silvery-gray back feathers and off-white chest feathers of a juvenile African penguin."